Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Net income	$ 13,764	$ 15,400
Weighted-average common shares outstanding - basic	49,282,000	49,079,000
Effect of dilutive restricted stock units and stock options	1,666,000	206,000
Weighted-average common shares outstanding - diluted	50,948,000	49,285,000
Net income per share: Basic	$ 0.28	$ 0.31
Net income per share: Diluted	$ 0.27	$ 0.31
Anti-dilutive shares not included above	930,000	1,704,000
Convertible Notes [Member]
Percentage of conversion price	130.00%
Conversion price, shares	33.0579
Conversion price	$ 30.25

Debt Instrument, Convertible, Equity Shares

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The price per share of the conversion feature embedded in the debt instrument.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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